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A star cyclist is gunned down by a friend's jealous girlfriend, and the international chase to find the suspect.

A North Dakota student is abducted after shopping at the mall; inside the hunt to catch a killer before he kills again.

When a woman is found murdered, a written confession gives insight into the mind of her killer.

Gypsy-Rose Blanchard's story of murder, family, romance, deception and abuse; her first interview after her release from prison.

An attempted kidnapping leads police to a killer.

Conspiracy, escorts, and murder-for-hire. An exclusive inside look at the undercover investigation.

A U.S. Army Sergeant is murdered; investigators uncover a heartless plot of adultery and greed.

A mysterious brutal murder and the bizarre home renovation that may have been the motive.

A Florida university campus is on edge when a student disappears. Police say love, lies and obsession led to murder.

A mom who would stop at nothing to find her daughter after she vanished, and the team of investigators who solved the deadly mystery.

When four young women go missing, police hunt for a serial killer roaming the interstate. John Quiñones takes us into the families' quests for answers.

Ruby Franke, a popular YouTuber, sees her world implodes after her emaciated son escapes.

When a young couple is found dead, police learn they were involved in an online feud and uncover a deadly catfishing scheme.

A teen girl vanishes after getting into an unknown vehicle. When the truth of her disappearance comes to light, the community is shocked by who is behind the violent plot.

It seemed like life in the small town of Selmer, Tennessee, revolved around the well-known and beloved church pastor Matthew Winkler. Matthew, along with his wife Mary and their three daughters, were seen as a perfect family — until parishioners discovered their pastor's body in the family's home, and Mary and the daughters were nowhere to be found.